Structure and dynamics of the upper mantle beneath the Alpine–Himalayan orogenic belt, from teleseismic tomography

Koulakov, I.; Tychkov, S. A.; Bushenkova, Natalia; Vasilevsky, Alexander

doi:10.1016/s0040-1951(02)00418-3

Cited by 51 publications

(39 citation statements)

References 32 publications

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“…The nearest unambiguous trace of a subducted slab outside the CPR has been identified along the eastern shoreline of the Adriatic Sea and at its northern continuation beneath the Po Plain (Koulakov et al, 2002;Lippitsch et al, 2003;Piromallo and Morelli, 2003). It is a north-northeastward-dipping slab that can be detected down to 600 km.…”

Section: Geophysical Constraintsmentioning

confidence: 94%

Middle Miocene volcanism in the vicinity of the Middle Hungarian zone: Evidence for an inherited enriched mantle source

Kovàcs

Szabolcs

2008

Journal of Geodynamics

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Section: Geophysical Constraintsmentioning

confidence: 94%

Middle Miocene volcanism in the vicinity of the Middle Hungarian zone: Evidence for an inherited enriched mantle source

Kovàcs

Szabolcs

2008

Journal of Geodynamics

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“…The algorithm of tomographic inversion was developed by Koulakov et al (2002) and then significantly modified by Koulakov and Sobolev (2006). The parameterization of the velocity models is performed using the nodes installed according to the ray density on horizontal levels at depths of 10,25,50,100,150,220,290,360,430,500,570,640,710,780,850,930, and 1000 km.…”

Section: Data and Tomography Algorithmmentioning

confidence: 99%

Subduction or delamination beneath the Apennines? Evidence from regional tomography

et al. 2015

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Abstract. In this study we present a new regional tomography model of the upper mantle beneath Italy and the surrounding area derived from the inversion of travel times of P and S waves from the updated International Seismological Centre (ISC) catalogue. Beneath Italy, we identify a highvelocity anomaly which has the appearance of a long, narrow "sausage" with a steeply dipping part down to a depth of 400 km and then expanding horizontally over approximately 400 km. Rather than to interpret it as a remnant of the former Tethyan oceanic slab, we consider that it is made up of the infra continental lithospheric mantle of Adria, which is progressively delaminated, whereas its overlying crust becomes progressively accreted into the Apenninic tectonic wedge.

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“…Regional tomographic inversion in this study is based on the approach proposed by (Koulakov et al, 2002). In later works, this algorithm was modified and used to study the upper mantle structure beneath some regions (see, for example, Koulakov et al, 2009a;Koulakov, 2011).…”

Section: K Jaxybulatov Et Al: Segmentation Of the Izu-bonin And Marmentioning

confidence: 99%

Segmentation of the Izu-Bonin and Mariana slabs based on the analysis of the Benioff seismicity distribution and regional tomography results

2013

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Abstract. We present a new model of P and S velocity anomalies in the mantle down to a depth of 1300 km beneath the Izu-Bonin and Mariana (IBM) arcs. This model is derived based on tomographic inversion of global travel time data from the revised ISC catalogue. The results of inversion are thoroughly verified using a series of different tests. The obtained model is generally consistent with previous studies by different authors. We also present the distribution of relocated deep events projected to the vertical surface along the IBM arc system. Unexpectedly, the seismicity forms elongated vertical clusters instead of horizontal zones indicating phase transitions in the slab. We propose that these vertical seismicity zones mark zones of intense deformation and boundaries between semi-autonomous segments of the subducting plate. The P and S seismic tomography models consistently display the slab as prominent high-velocity anomalies coinciding with the distribution of deep seismicity. We can distinguish at least four segments which subduct differently. The northernmost segment of the Izu-Bonin arc has the gentlest angle of dipping which is explained by backward displacement of the trench. In the second segment, the trench stayed at the same location, and we observe the accumulation of the slab material in the transition zone and its further descending to the lower mantle. In the third segment, the trench is moving forward causing the steepening of the slab. Finally, for the Mariana segment, despite the backward displacement of the arc, the subducting slab is nearly vertical. Between the Izu-Bonin and Mariana arcs we clearly observe a gap which can be traced down to about 400 km in depth. Based on joint consideration of the tomography results and the seismicity distribution, we propose two different scenarios of the subduction evolution in the IBM zone during the recent time, depending on the reference frame of plate displacements. In the first case, we consider the movements in respect to the Philippine Plate, and explain the different styles of the subduction by the relative backward and forward migrations of the trench. In the second case, all the elements of the subduction system move westward in respect to the stable Asia. Different subduction styles are explained by the "anchoring" of selected segments of the slab, different physical properties of the subducting plate and the existence of buoyant rigid blocks related to sea mount and igneous provinces.

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Structure and dynamics of the upper mantle beneath the Alpine–Himalayan orogenic belt, from teleseismic tomography

Cited by 51 publications

References 32 publications

Middle Miocene volcanism in the vicinity of the Middle Hungarian zone: Evidence for an inherited enriched mantle source

Middle Miocene volcanism in the vicinity of the Middle Hungarian zone: Evidence for an inherited enriched mantle source

Subduction or delamination beneath the Apennines? Evidence from regional tomography

Segmentation of the Izu-Bonin and Mariana slabs based on the analysis of the Benioff seismicity distribution and regional tomography results

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